http://elecraft.85.s1.nabble.com/KX3-Receive-Performance-Below-1500-kHz-tp7558831p7558855.html
An Elecraft Transverter for below 510 kHz would be well received, world wide. I guess the number of participants would be rather low to start with but interest would increase with the availability of such an item. A poll of the amateur market would give a good indication of interest. If the numbers aren't there to warrant such venture, then maybe one of the small kit-providers might pick up the banner.
Presently, I see two potential customers; KL7UW and myself. How's that for a start? ;)
. .
> From:
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> To:
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> Date: Sun, 8 Jul 2012 08:49:25 -0700
> CC:
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> Subject: Re: [Elecraft] KX3 Receive Performance Below 1500 kHz
>
> Hi Ed,
>
> The KX3's spec also says, "Note: Sensitivity decreases gradually below
> 1.5 MHz due to protective high-pass filtering...." We did this to
> ensure that the PIN diodes in the T/R switch are protected. A fairly
> large amount of attenuation is required by the time you get down to
> 500 kHz or lower.
>
> We did do some transmit tests in the 470 kHz range. We can easily get
> +10 or possibly +20 dBm output at these frequencies, but you'd need an
> external filter/amplifier to obtain useful transmit power output.
> Given that, I would think that an external receiving converter that
> shifted the 0-1 MHz range up to 7-8 MHz on the KX3 would also be a
> good solution. The KX3 has transverter bands that can be set up for
> this application, allowing the VFO to read correctly when on this
> band. The ACC2 GPIO pin could be used to turn the external converter
> on/off.
>
> The K3 has the same high-pass filtering in the main antenna path as
> the KX3. But the K3 also provides a way to bypass the filter, by using
> the KXV3's RX ANT input (or the XVTR input).
>
> 73,
> Wayne
> N6KR
>
>